Melting and casting process and quality control of Al-6.3Zn-2.0Mg-0.32Cu aluminum alloy

doi:10.13251/j.issn.0254-6051.2023.06.004

Abstract

Abstract: Melting and casting process of Al-6.3Zn-2.0Mg-0.32Cu aluminum alloy ingots was investigated by optical microscope (OM), field emission scanning electron microscopy (SEM) and X-ray diffraction analyzer (XRD) in aspects of furnace charge, melting, in-furnace refining, online purification treatment of melt and casting process parameters. The results show that the hydrogen content of melt can be controlled within 0.14 mL/100 g, and slag content and ingot segregation can be reduced by controlling the reflow material within 10% and the Zn/Mg ratio being set to 3.2, the melting carries out by a double-rotor refining system, and the casting speed, casting temperature and cooling water flow rate being set to 64-69 mm/min, 700-715 ℃ and 138-144 m³/h/root, respectively, which provides data support for the subsequent production of aluminum alloy ingots of this specification.

Key words: Al-6.3Zn-2.0Mg-0.32Cu alloy, composition design, melting and casting process, segregation

CLC Number:

TG166.3

Xu Fanfan, Li Heng, Xu Yanchen, Wang Dongming, Li Yukun, Qian Yuerong, Wu Yucheng. Melting and casting process and quality control of Al-6.3Zn-2.0Mg-0.32Cu aluminum alloy[J]. Heat Treatment of Metals, 2023, 48(6): 23-28.

References

[1]郑卫东, 杜旭初, 樊振中, 等. 精炼工艺对ZL101A铝合金熔体质量的影响[J]. 特种铸造及有色合金, 2017, 37(4): 436-438.
Zheng Weidong, Du Xuchu, Fan Zhenzhong, et al. Effect of refining process on quality of the ZL101A aluminum alloy[J]. Special-cast and Non-ferrous Alloys, 2017, 37(4): 436-438.
[2]韦修勋, 陈愿情, 贾桂龙, 等. 半连铸7055铝合金扁锭偏析瘤缺陷分析及工艺优化[J]. 特种铸造及有色合金, 2020, 40(11): 1290-1293.
Wei Xiuxun, Chen Yuanqing, Jia Guilong, et al. Defect analysis of segregation tumors in 7055 aluminum alloy flat ingot and process optimization[J]. Special-cast and Non-ferrous Alloys, 2020, 40(11): 1290-1293.
[3]赵海越. 7050铝合金半固态压铸缺陷控制及组织性能研究[D]. 北京: 有色金属研究总院, 2019.
Zhao Haiyue. Study on defect control and tissue properties of 7050 aluminum alloy for semi-solid die casting[D]. Beijing: General Research Institute of Nonferrous Metals, 2019.
[4]Alkhaqani B. Reviews on effect of additions the alloying element on the microstructure and mechanical properties of aluminum alloys[J]. International Journal of Engineering and Technology, 2020, 12(2): 155-159.
[5]欧阳惠. Zn/Mg比对Al-Zn-Mg-Cu合金淬火敏感性的影响[D]. 长沙: 中南大学, 2013.
Ouyang Hui. Effect of Zn/Mg ratio on the quenching sensitivity of Al-Zn-Mg-Cu alloy[D]. Changsha: Central South University, 2013.
[6]朱金鑫. 7000系铝合金淬透性理论研究及Mg、Zr和Cu对7000系超高强轧制材铝合金组织和性能的影响[D]. 镇江: 江苏大学, 2017.
Zhu Jinxin. Theoretical study on the hardenability of 7000 series aluminum alloys and the effects of Mg, Zr and Cu on the microstructure and properties of 7000 series ultra-high strength rolled aluminum alloys[D]. Zhenjiang: Jiangsu University, 2017.
[7]Vsevolod I, Razumovskiy A V, Ruban I M, et al. The effect of alloying elements on grain boundary and bulk cohesion in aluminum alloys: An ab initio study[J]. Scripta Materialia, 2011, 65(10): 926-929.
[8]Joshua J J, Andrews A. Design of experiments to optimize casting process of aluminum alloy 7075 in addition of TiO₂ using Taguchi method[J]. Materials Today: Proceedings, 2020, 33.
[9]陈保安, 张静媛, 祝志祥, 等. 化学成分对高强Al-Mg-Si合金组织和性能的影响[J]. 金属热处理, 2022, 47(4): 30-38.
Chen Baoan, Zhang Jingyuan, Zhu Zhixiang, et al. Effect of chemical composition on microstructure and properties of high strength Al-Mg-Si alloys[J]. Heat Treatment of Metals, 2022, 47(4): 30-38.
[10]陈保安, 祝志祥, 韩钰, 等. 化学成分对Al-Mg-Si合金组织及性能的影响[J]. 金属热处理, 2017, 42(12): 85-89.
Chen Baoan, Zhu Zhixiang, Han Yu, et al. Effect of chemical composition on microstructure and properties of Al-Mg-Si alloy[J]. Heat Treatment of Metals, 2017, 42(12): 85-89.
[11]张进松, 许晓静, 张洁, 等. Zn、Mg对5A06型铝合金热轧材性能的影响[J]. 金属热处理, 2019, 44(12): 72-74.
Zhang Jinsong, Xu Xiaojing, Zhang Jie, et al. Effect of Zn and Mg on properties of hot rolled 5A06 aluminum alloy[J]. Heat Treatment of Metals, 2019, 44(12): 72-74.
[12]Ma S, Zong N, Dong H, et al. Effect of Al-V-B grain refiner on refining aluminium alloys: Estimation from ab initio calculations[J]. IOP Conference Series Materials Science and Engineering, 2020, 861: 012047.
[13]丁海民, 王同贺, 张子寒, 等. Al-5Ti-1B中间合金在铝熔体中的沉淀行为[J]. 材料热处理学报, 2022, 43(5): 31-39.
Ding Haimin, Wang Tonghe, Zhang Zihan, et al. Sedimentation behavior of Al-5Ti-1B master alloy in aluminum melt[J]. Transactions of Materials and Heat Treatment, 2022, 43(5): 31-39.
[14]徐超. Al-5Ti-1B细化剂作用下半固态7A04铝合金组织与性能研究[D]. 成都: 西南交通大学, 2017.
Xu Chao. Study on the microstructure and properties of semi-solid 7A04 aluminum alloy under the action of Al-5Ti-1B refiner[D]. Chengdu: Southwest Jiaotong University, 2017.
[15]赵宇, 魏午, 黄晖, 等. 6070铝合金的均匀化热处理[J]. 金属热处理, 2023, 48(3): 51-57.
Zhao Yu, Wei Wu, Huang Hui, et al. Homogenization heat treatment of 6070 aluminum alloy[J]. Heat Treatment of Metals, 2023, 48(3): 51-57.